A small and medium-sized seawater industrialized aquaculture tail water biological treatment integrated device

Abstract

The application relates to a small and medium-sized seawater industrial breeding tail water biological treatment integrated device, which comprises independently-operated three-dimensional purification units, the three-dimensional purification units are divided into an upper layer of shellfish purification area, a middle layer of alga purification area and a lower layer of halophyte purification area from top to bottom in the vertical direction, a crossbar is arranged on the top of the upper layer of shellfish purification area, one side of the crossbar is rotationally matched with a side wall through a torsional spring, the other side of the crossbar is provided with a semicircular protrusion, the upper layer of shellfish purification area is further provided with a rotating rod and a driving motor, and a cam is arranged on the upper portion of the rotating rod. The application can realize shellfish breeding cage swinging and water outlet opening and closing through forward and reverse rotation, can simulate sea current environment to improve shellfish filter-feeding activity, and can control water discharge according to needs; the modular detachable structure design can independently carry out biological screening experiments on single units, multiple units can be assembled and combined for large-scale operation, and the application can be flexibly adapted to different breeding varieties, different seasons and different tail water load working conditions.

Description

Technical Field

[0001] This application relates to the field of marine aquaculture wastewater treatment technology, specifically to a small-to-medium-sized integrated biological treatment device for marine industrial aquaculture wastewater. Background Technology

[0002] In recent years, the marine industrial aquaculture industry has developed rapidly. While high-density, intensive aquaculture has brought high yields, it has also generated a large amount of aquaculture wastewater rich in nitrogen, phosphorus, nutrients, chemical oxygen demand (COD), and suspended particulate matter. Direct discharge of this wastewater can easily cause eutrophication in nearshore waters, leading to ecological problems such as red tides and green tides. Currently used physicochemical treatment methods are costly and have limited effectiveness in removing nitrogen and phosphorus, while biological treatment methods are widely studied due to their green, low-carbon, and low-operating-cost characteristics.

[0003] Existing combined shellfish, algae, and plant purification devices are mostly static mixed aquaculture structures, which have significant shortcomings: First, shellfish are in a static state for long periods, resulting in low filter-feeding activity and a tendency to close their shells and stop feeding; the culture cages are prone to clogging due to accumulated dirt, leading to unstable purification efficiency. Second, shellfish excrement and uneaten feed fall directly into the lower layer, easily causing siltation and putrefaction, resulting in secondary pollution. Third, most devices are integrated, fixed structures, making it impossible to disassemble them for independent experiments, hindering the flexible selection of optimal biological combinations, and making it difficult to adapt to different aquaculture species and seasonal conditions. Therefore, developing a structurally integrated, functionally multifunctional, flexible, and efficient marine aquaculture wastewater biological treatment device is of significant practical importance. Summary of the Invention

[0004] In view of this, the purpose of this application is to provide a small-to-medium-sized integrated biological treatment device for wastewater from marine industrial aquaculture. Through a modular three-dimensional hierarchical structure, a forward and reverse dual-function drive mechanism, and a filter flow stabilization arrangement, it realizes dynamic shellfish aquaculture, tiered purification, and flexible assembly and operation, significantly improving the wastewater purification effect and the applicability of the device.

[0005] The objective of this application is achieved through the following technical solution: A small-to-medium-sized integrated biological treatment device for wastewater from marine industrial aquaculture includes an independently operable three-dimensional purification unit. The three-dimensional purification unit is vertically divided into an upper shellfish purification zone, a middle algae purification zone, and a lower halophyte purification zone from top to bottom. A horizontal bar is mounted on the top of the upper shellfish purification zone. One side of the horizontal bar is rotatably engaged with the side wall via a torsion spring, and the other side of the horizontal bar has a semi-circular protrusion. The upper shellfish purification zone also includes a rotating rod and a drive motor. A sandwich layer is located at the bottom of the upper shellfish purification zone. A water outlet is provided on one side of the layer, and the water outlet has a curved bend near the rotating rod. A baffle plate is provided inside the interlayer. The bottom of the rotating rod is fixedly connected to the baffle plate. A cam is fitted on the upper part of the rotating rod. The cam cooperates with the semi-circular protrusion on the crossbar. A shellfish culture cage is suspended at the bottom of the crossbar. A filter screen is provided below the water outlet. The middle layer algae purification zone is used to grow purification algae. The lower layer halophyte purification zone is used to grow halophytes. Multiple three-dimensional purification units are connected by detachable partitions.

[0006] Preferably, the drive motor is used to drive the rotating rod to rotate. When the rotating rod rotates clockwise, it drives the cam to rotate. The cam intermittently pushes the semi-circular protrusion on the crossbar. With the restoring force of the torsion spring, the crossbar drives the shellfish farming cage to sway back and forth. When the rotating rod rotates counterclockwise, it drives the baffle plate to open the water outlet.

[0007] Preferably, the cross-section of the barrier plate is larger than the cross-section of the outlet.

[0008] Preferably, the filter screen has a detachable structure and is used to trap uneaten feed, feces and biological debris produced by shellfish farming, preventing pollutants from entering the middle layer algae purification zone.

[0009] Preferably, a flow stabilizing device is provided below the filter screen. The flow stabilizing device is a porous flow stabilizing plate or an overflow weir, which is used to make the filtered tailwater fall smoothly into the middle layer of algae purification zone.

[0010] Preferably, the shellfish culture cage is a hanging cage structure, and the interior is used to place filter-feeding shellfish such as oysters, scallops, and mussels.

[0011] Preferably, the detachable partition is a sealed plug-in structure, and adjacent three-dimensional purification units are independently separated or connected through the partition, allowing for individual experiments or combined operation.

[0012] Preferably, the middle algae purification zone is used to cultivate large algae such as Ulva prolifera, Gracilaria, and Spirulina, and an opening is provided on one side of the middle algae purification zone. The lower halophyte purification zone is used to cultivate halophytes such as Portulaca grandiflora and Suaeda salsa.

[0013] Preferably, a rotating disk is provided above the rotating rod, the output shaft of the drive motor is fixedly connected to the top of the rotating disk, and the rotating rod is located at the bottom of the rotating disk.

[0014] Preferably, the cam is an eccentric wheel structure, and the mating surface with the semi-circular protrusion is a smooth arc surface to ensure the smoothness of the reciprocating motion of the crossbar.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The dual-function drive mechanism is ingeniously designed. The same drive motor can realize the shaking of the shellfish culture cage and the opening and closing of the water outlet by reversing forward and reverse. It has a compact structure, low energy consumption and simple control. It can both simulate the ocean current environment to improve the filter feeding activity of shellfish and control the amount of water discharged as needed.

[0016] 2. It adopts a three-dimensional hierarchical structure with shellfish in the upper layer, algae in the middle layer, and halophytes in the lower layer. Combined with filter screen interception and stable water distribution, it realizes tiered treatment of filter feeding and suspension removal, algae denitrification, and deep plant purification, avoiding secondary pollution, and achieving higher purification efficiency and more stable effluent.

[0017] 3. Modular and detachable structural design: a single unit can independently carry out biological screening experiments, and multiple units can be assembled and combined for large-scale operation. It can flexibly adapt to different aquaculture species, different seasons and different tailwater load conditions, and has strong practicality and scalability.

[0018] 4. The whole device is an integrated unit, which occupies a small area, is easy to install, and is simple to operate and maintain. Compared with physical and chemical treatment methods, the cost is greatly reduced. At the same time, it can harvest shellfish, algae, halophytes and other products with economic value, thus achieving both ecological and economic benefits. Attached Figure Description

[0019] Figure 1 A schematic diagram of the overall structure of a small-to-medium-sized integrated biological treatment device for wastewater from industrialized seawater aquaculture, provided for some embodiments of this application; Figure 2 A top view of a small-to-medium-sized integrated biological treatment device for wastewater from industrialized seawater aquaculture, provided for some embodiments of this application; Figure 3 A schematic diagram of the overall structure of the three-dimensional purification unit provided in some embodiments of this application; Figure 4 for Figure 3 A detailed structural diagram of point A in the middle; Figure 5 for Figure 3 A schematic diagram of the specific structure at point B in the middle; Figure 6 Another overall structural schematic diagram of the three-dimensional purification unit provided for some embodiments of this application; Figure 7 yes Figure 6 A schematic diagram of the specific structure at point C.

[0020] Icons: 1. Three-dimensional purification unit; 2. Upper shellfish purification zone; 3. Middle algae purification zone; 4. Lower halophyte purification zone; 5. Horizontal bar; 6. Torsion spring; 7. Semi-circular protrusion; 8. Drive motor; 9. Rotating rod; 10. Cam; 11. Interlayer; 12. Water outlet; 13. Baffle plate; 14. Shellfish culture cage; 15. Filter screen; 16. Flow stabilizing and water distribution device; 17. Removable partition; 18. Rotating disc; 19. Curved bend. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments. The same reference numerals in the accompanying drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the described embodiments of this application without creative effort are within the scope of protection of this application.

[0022] Compared to the embodiments shown in the accompanying drawings, feasible embodiments within the scope of this application may have fewer components, other components not shown in the drawings, different components, differently arranged components, or components with different connections, etc. Furthermore, two or more components in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components.

[0023] See attached document Figures 1 to 4 This application proposes a small-to-medium-sized integrated biological treatment device for wastewater from marine industrial aquaculture, comprising an independently operable three-dimensional purification unit 1. The three-dimensional purification unit 1 is divided vertically from top to bottom into an upper shellfish purification zone 2, a middle algae purification zone 3, and a lower halophyte purification zone 4. A horizontal bar 5 is mounted on the top of the upper shellfish purification zone 2. One side of the horizontal bar 5 is rotatably engaged with the side wall via a torsion spring 6, and the other side of the horizontal bar 5 is provided with a semi-circular protrusion 7, which is located on the side near the rotating rod 9. The upper shellfish purification zone 2 is also provided with a rotating rod 9 and a drive motor 8, wherein the drive motor 8 is used to drive the rotation of the rotating rod 9. A rotating disk 18 is provided above the rotating rod 9, and the output shaft of the drive motor 8 is fixedly connected to the top of the rotating disk 18. The rotating rod 9 is located at the bottom of the rotating disk 18.

[0024] See attached document Figures 5 to 7The bottom of the upper shellfish purification zone 2 is provided with a sandwich layer 11, and an outlet 12 is provided on one side of the sandwich layer 11. The outlet 12 is provided with a curved bend 19 near the rotating rod 9, which provides space for the swing of the rotating rod 9. A baffle plate 13 is provided inside the sandwich layer 11. The bottom of the rotating rod 9 is fixedly connected to the baffle plate 13. A cam 10 is fitted on the upper part of the rotating rod 9. The cam 10 cooperates with the semi-circular protrusion 7 on the crossbar 5. A shellfish culture cage 14 is suspended at the bottom of the crossbar 5. Filter-feeding shellfish such as oysters, scallops or mussels are raised in the cage. A filter screen 15 is provided below the outlet 12. The middle algae purification zone 3 is used to grow purification algae, and the lower halophyte purification zone 4 is used to grow halophytes.

[0025] See attached document Figure 4 The cam 10 is an eccentric wheel structure, and the mating surface with the semi-circular protrusion 7 is a smooth arc surface, which ensures the stability of the reciprocating motion of the crossbar 5. The smooth arc surface matches the arc contour of the semi-circular protrusion 7, making the process of the cam 10 pushing and disengaging from the semi-circular protrusion 7 smoother. This ensures the stability of the crossbar 5 when it drives the shellfish farming cage 14 to reciprocate and avoids the stress response of the shellfish caused by violent shaking, thus meeting the dual needs of simulating the natural ocean current environment and protecting the activity of the shellfish.

[0026] Multiple three-dimensional purification units 1 are connected by detachable partitions 17. They can be separated independently for conducting control experiments to screen the optimal combination of shellfish, algae and halophytes, or the partitions can be removed to connect them for large-scale treatment of aquaculture wastewater.

[0027] The detachable partition 17 is a sealed plug-in structure. Adjacent three-dimensional purification units 1 are independently separated or connected through the partition, and can be used for experiments or combined operation. The detachable partition 17 is a high-strength sealed plug-in structure with elastic sealing strips on the edge of the partition to ensure the sealing between adjacent three-dimensional purification units 1 after plugging, preventing water crossflow from affecting experimental data or purification effect. Adjacent three-dimensional purification units 1 can be flexibly separated or connected through this partition. In the separated state, different types and densities of shellfish, algae and halophytes can be put into each unit to carry out biological combination screening, environmental adaptability and other control experiments. In the connected state, multiple units form a large-scale treatment system, which can meet the batch treatment needs of small and medium-sized marine industrial aquaculture tailwater. The overall use is highly flexible and adaptable to both experimental research and practical application scenarios.

[0028] The drive motor 8 is used to drive the rotating rod 9 to rotate. When the rotating rod 9 rotates clockwise, it drives the cam 10 to rotate. The cam 10 intermittently pushes the semi-circular protrusion 7 on the crossbar 5. With the restoring force of the torsion spring 6, the crossbar 5 drives the shellfish farming cage 14 to reciprocate. When the rotating rod 9 rotates counterclockwise, it drives the cam 10 to rotate. The rotating rod 9 drives the baffle plate 13 to open the outlet 12, allowing the treated water from the upper layer to drain down.

[0029] The cross-section of the baffle plate 13 is larger than that of the outlet 12, which can achieve reliable sealing. The baffle plate 13 has a larger area, and when the baffle plate 13 swings intermittently with the rotating rod 9, it can still seal the outlet 12.

[0030] The filter screen 15 is a detachable structure used to trap uneaten feed, feces, and biological debris produced by shellfish farming, preventing pollutants from entering the middle algae purification zone 3. Below the filter screen 15 is a flow stabilizing device 16, which is a porous flow stabilizing plate or overflow weir, used to ensure that the filtered tailwater falls smoothly into the middle algae purification zone 3.

[0031] The shellfish culture cage 14 is a hanging cage structure, used to house filter-feeding shellfish such as oysters, scallops, and mussels. The cage 14 features a perforated hanging cage structure, with the cage body made of corrosion-resistant plastic or metal. Evenly distributed perforations are cut into the cage walls to ensure that the culture wastewater flows smoothly through the cage and makes full contact with the shellfish. Inside the cage, common local filter-feeding shellfish such as oysters, scallops, and mussels are placed in layers. This layered design prevents excessive stacking of shellfish, ensuring that each shellfish receives sufficient water and food, further improving the efficiency of filter feeding and purification.

[0032] The middle-layer algae purification zone 3 is used for large-scale cultivation of large algae with strong purification capabilities, such as *Ulva prolifera*, *Gracilaria*, and *Spirulina*. The algae are arranged using rope suspension or net cage fixation to ensure they fully extend in the water. One side of the middle-layer algae purification zone 3 has an openable / closable opening. This opening facilitates rapid water exchange, ensuring the supply of dissolved oxygen and nutrients needed for algae growth, and also allows staff to regularly harvest, replant, and maintain the algae, preventing excessive algae growth and water blockage. The lower-layer halophyte purification zone 4 is used to cultivate halophytes with strong salt tolerance and excellent nitrogen and phosphorus accumulation capabilities, such as *Portulaca oleracea* and *Suaeda salsa*. The plants are fixed using ecological floating bed cultivation or substrate cultivation. Their extensive root systems can penetrate deep into the water to further absorb the nitrogen and phosphorus nutrients remaining after the upper layer treatment, while also adsorbing residual trace suspended solids in the water, achieving deep purification and water quality stability of the effluent, ensuring that the effluent meets the aquaculture effluent discharge standards.

[0033] During operation, the wastewater from marine aquaculture first enters the upper shellfish purification zone 2. The drive motor 8 starts and rotates in the forward direction, driving the rotating rod 9 to rotate clockwise via the rotating disk 18. The eccentric wheel cam 10 on the upper part of the rotating rod 9 rotates synchronously with the rotating rod 9. Its eccentric wheel structure can continuously change the squeezing distance with the semi-circular protrusion 7. The smooth arc surface of the cam 10 intermittently or periodically pushes the semi-circular protrusion 7 on one side of the crossbar 5, causing the crossbar 5 to overcome the elastic force of the torsion spring 6 and deflect back and forth to one side. When the cam 10 and the semi-circular protrusion 7 are repeatedly squeezed, the crossbar 5 quickly returns to its original position under the restoring force of the torsion spring 6, forming a reciprocating motion. This, in turn, drives the hanging cage-type shellfish aquaculture cage 14 suspended at the bottom of the crossbar 5 to make small-amplitude, low-frequency reciprocating swaying. This swaying simulates the natural ocean current environment, which can prevent shellfish from closing their shells and stopping feeding due to static aquaculture, significantly improve their filter feeding activity, and efficiently remove suspended particles, uneaten feed, and some organic pollutants from the wastewater.

[0034] When the upper shellfish filter feeding process reaches the preset time, the drive motor 8 switches to reverse rotation, and the rotating rod 9 drives the cam 10 to rotate counterclockwise. At the same time, the baffle plate 13 fixed to the bottom of the rotating rod 9 rotates synchronously with the rotating rod 9. Since the cross-sectional size of the baffle plate 13 is larger than that of the outlet 12, the baffle plate 13 completely blocks the outlet 12 in the initial state. After the reverse rotation, the baffle plate 13 gradually moves away from the area of ​​the outlet 12, so that the outlet 12 is opened. The tailwater of the upper shellfish pretreatment flows down through the interlayer 11 and out of the outlet 12. The water first passes through the detachable filter screen 15 below the outlet 12. The filter screen 15 accurately intercepts the feces produced by shellfish metabolism, unfiltered feed residues and biological debris, preventing such pollutants from entering the lower layer and causing siltation and decay, thus blocking secondary pollution from the source.

[0035] After being filtered by filter screen 15, the effluent flows into the lower flow stabilizing and water distribution device 16. The water flows through evenly distributed holes or forms a thin water film along the overflow weir, falling smoothly and evenly to the middle algae purification zone 3 in a low-speed, uniform, and non-impact manner, avoiding direct water flow that could damage or disrupt the growth of algae. The large algae such as Ulva prolifera and Gracilaria planted in the middle algae purification zone 3 fully absorb the nitrogen and phosphorus nutrients in the effluent as nutrients needed for growth, while also degrading some of the chemical oxygen demand, achieving deep nitrogen and phosphorus removal from the effluent. The opening on one side of the middle layer ensures water circulation and dissolved oxygen supply, facilitating regular algae maintenance by staff.

[0036] After algae treatment, the wastewater flows into the lower halophyte purification zone 4. Halophytes such as *Portulaca oleracea* and *Suaeda salsa* further adsorb residual nitrogen, phosphorus, and trace suspended solids through their extensive root systems, achieving deep purification and water quality stabilization, ensuring the effluent meets the discharge standards for marine aquaculture wastewater. Throughout operation, multiple three-dimensional purification units 1 can flexibly switch operating modes via detachable partitions 17. When independently separated, each unit can be stocked with different types and densities of biological combinations to conduct control experiments and screen for the optimal solution. When connected and combined, they form a large-scale treatment system suitable for the batch wastewater treatment needs of small and medium-sized marine industrial aquaculture.

[0037] In the description of this invention, it should be understood that the terms "coaxial," "bottom," "one end," "top," "middle," "other end," "upper," "side," "top," "inner," "front," "center," "both ends," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0038] Furthermore, the terms “first,” “second,” “third,” and “fourth” are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as “first,” “second,” “third,” or “fourth” may explicitly or implicitly include at least one of those features.

[0039] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," "screw connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0040] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A small and medium-sized seawater factory breeding tail water biological treatment integrated device, characterized in that, The system includes an independently operable three-dimensional purification unit (1), which is vertically divided into an upper shellfish purification zone (2), a middle algae purification zone (3), and a lower halophyte purification zone (4) from top to bottom. A horizontal bar (5) is mounted on the top of the upper shellfish purification zone (2). One side of the horizontal bar (5) is rotated with the side wall via a torsion spring (6), and the other side of the horizontal bar (5) is provided with a semi-circular protrusion (7). The upper shellfish purification zone (2) is also equipped with a rotating rod (9) and a drive motor (8). The bottom of the upper shellfish purification zone (2) is provided with a sandwich layer (11), and a water outlet (12) is opened on one side of the sandwich layer (11). A curved bend (19) is provided on the side near the rotating rod (9). A baffle plate (13) is provided inside the interlayer (11). The bottom of the rotating rod (9) is fixedly connected to the baffle plate (13). A cam (10) is sleeved on the upper part of the rotating rod (9). The cam (10) cooperates with the semi-circular protrusion (7) on the crossbar (5). A shellfish breeding cage (14) is suspended at the bottom of the crossbar (5). A filter screen (15) is provided below the outlet (12). The middle layer algae purification zone (3) is used to grow purification algae. The lower layer halophyte purification zone (4) is used to grow halophytes. Multiple three-dimensional purification units (1) are connected by a detachable partition (17).

2. The integrated biological treatment device for wastewater from small-to-medium-sized marine aquaculture as described in claim 1, characterized in that, The drive motor (8) is used to drive the rotating rod (9) to rotate. When the rotating rod (9) drives the cam (10) to rotate clockwise, the cam (10) intermittently pushes the semi-circular protrusion (7) on the crossbar (5). With the restoring force of the torsion spring (6), the crossbar (5) drives the shellfish farming cage (14) to swing back and forth. When the rotating rod (9) drives the cam (10) to rotate counterclockwise, the rotating rod (9) drives the baffle plate (13) to open the water outlet (12).

3. The integrated biological treatment device for wastewater from small-to-medium-sized marine aquaculture as described in claim 1, characterized in that, The cross-section of the barrier plate (13) is larger than the cross-section of the outlet (12).

4. The integrated biological treatment device for wastewater from small-to-medium-sized marine aquaculture as described in claim 1, characterized in that, The filter (15) is a detachable structure used to trap uneaten feed, feces and biological debris produced by shellfish farming, preventing pollutants from entering the middle algae purification zone (3).

5. The integrated biological treatment device for wastewater from small-to-medium-sized marine aquaculture as described in claim 1, characterized in that, Below the filter screen (15) is a flow stabilizing device (16), which is a porous flow stabilizing plate or an overflow weir, used to make the filtered tailwater fall smoothly into the middle layer algae purification zone (3).

6. The integrated biological treatment device for wastewater from small-to-medium-sized marine aquaculture as described in claim 1, characterized in that, The shellfish culture cage (14) is a hanging cage structure, and the interior is used to place filter-feeding shellfish such as oysters, scallops, and mussels.

7. The integrated biological treatment device for wastewater from small-to-medium-sized marine aquaculture as described in claim 1, characterized in that, The detachable partition (17) is a sealed plug-in structure. Adjacent three-dimensional purification units (1) are independently separated or connected through the partition, and can be used for experiments or combined operation.

8. The integrated biological treatment device for wastewater from small-to-medium-sized marine aquaculture as described in claim 1, characterized in that, The middle algae purification zone (3) is used to grow large algae such as seaweed, grapple, and spirulina. An opening is provided on one side of the middle algae purification zone (3). The lower halophyte purification zone (4) is used to grow halophytes such as seahorse purslane and Suaeda salsa.

9. The integrated biological treatment device for wastewater from small-to-medium-sized marine aquaculture as described in claim 1, characterized in that, A rotating disk (18) is provided above the rotating rod (9), the output shaft of the drive motor (8) is fixedly connected to the top of the rotating disk (18), and the rotating rod (9) is located at the bottom of the rotating disk (18).

10. The integrated biological treatment device for wastewater from small-to-medium-sized marine aquaculture as described in claim 1, characterized in that, The cam (10) is an eccentric wheel structure, and the mating surface with the semi-circular protrusion (7) is a smooth arc surface, which ensures the smoothness of the reciprocating motion of the crossbar (5).

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